The timing and abundance of shorebirds migrating through Idaho are inadequately known. Prior studies have been limited to anecdotal observations and annotated checklists with an emphasis on northern Idaho (Larrison et al. 1967, Burleigh 1972). This study revises and improves our knowledge of migrating shorebirds in the state. It also provides quantitative data on fall shorebird migration from two sites along the northern edge of the Great Basin, an area in North America where shorebird movement is poorly known (Morrison and Myers 1987). We show here that many species are much more abundant in Idaho than recorded by Larrison et al. (1967) or Burleigh (1972). For a few species this is also true for the Intermountain West as a whole.